Thick band of neural fibers connecting the brain's two hemispheres.

• A. Frontal lobe
• B. Corpus callosum
• C. Cerebellum
• D. Medulla oblongata

Answer: (B)

Interhemispheric communication is built through a large bundle of white matter fibers that links the left and right cerebral hemispheres. This structure, the corpus callosum, is the largest commissural pathway in the brain and runs along the midline. It allows motor, sensory, and cognitive information to be shared between the hemispheres, coordinating activities that involve both sides of the body. Damage to it or cases where it’s severed (as in split-brain studies) show what happens when cross-hemisphere signaling is reduced. The frontal lobe is a cerebral region involved in planning and movement; the cerebellum coordinates movement and balance; the medulla oblongata controls autonomic functions in the brainstem.